The Nature of Magnetic Ordering in Magnetically Doped Topological Insulator Bi$_{2-x}$Fe$_x$Se$_3$

Details The Nature of Magnetic Ordering in Magnetically Doped Topological Insulator Bi$_{2-x}$Fe$_x$Se$_3$ The Nature of Magnetic Ordering in Magnetically Doped Topological Insulator Bi$_{2-x}$Fe$_x$Se$_3$

2012-03-21

arxiv.org/abs/1203.4850v1

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages and 6 figures

Scientific paper

We present a detailed investigation of the magnetic and structural properties of magnetically doped 3D topological insulator Bi2Se3. From muon spin relaxation measurements in zero magnetic field, we find that even 5% Fe doping on the Bi site turns the full volume of the sample magnetic at temperatures as high as ~250 K. This is also confirmed by magnetization measurements. Two magnetic "phases" are identified; the first is observed between ~10-250 K while the second appears below ~10 K. These cannot be attributed to impurity phases in the samples. We discuss the nature and details of the observed magnetism and its dependence on doping level.

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